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How to Stream to YouTube, Twitch, and TikTok Simultaneously

How to Stream to YouTube, Twitch, and TikTok Simultaneously

Three platforms, one phone, zero extra work.

YouTube brings search traffic and VODs that keep working for years. Twitch brings the most dedicated live audience on the internet. TikTok brings discovery — strangers who'd never find you otherwise. Running all three at once means every minute you spend live is working three jobs.

Before you start: the account checklist

  • A Castream account with the mobile app installed (or access to Castream Web)
  • A YouTube channel with live streaming enabled (new channels may need verification first)
  • A Twitch account — no special requirements, any account works
  • A TikTok account with LIVE access and RTMP availability. Not every TikTok account can stream via RTMP — you need to see a Server URL and Stream Key option in TikTok's LIVE setup area. If it's not there, run the YouTube + Twitch pair until it does. Our TikTok RTMP guide shows exactly where to look.
  • A stable connection. Three outbound streams share your upload bandwidth. Wi-Fi or wired for desktop setups; strong Wi-Fi or 5G on mobile.

Connect all three destinations

Do this once — destinations stay saved until you remove them.

YouTube

  1. Castream app → Settings → Destinations → YouTube
  2. Sign in with Google, authorize Castream, choose your channel
  3. Save

Twitch

  1. Settings → Destinations → Twitch
  2. Log in to Twitch and authorize — Castream uses OAuth, so there's no stream key to copy
  3. Save

TikTok (RTMP)

  1. In TikTok, open the LIVE setup area and find Stream key / Go LIVE from desktop / Streaming software
  2. Copy your Server URL and Stream Key
  3. Castream → Settings → Destinations → TikTok, paste both, save

Keep that stream key private, and remember TikTok keys can expire between sessions. If TikTok ever stops receiving your stream while the others keep going, a fresh key is the first fix to try.

Phone or OBS

Go with your phone if your content is you talking, teaching, coaching, or showing something in the real world. Open app, toggle three destinations, go live.

Go with OBS if you need overlays, alerts, screen sharing, or multiple cameras. You don't stream from OBS to three platforms — you stream from OBS to Castream once, and Castream forwards it everywhere:

  1. In Castream Web, confirm all three destinations are connected
  2. Copy your Castream RTMP URL and Stream Key from the dashboard
  3. OBS → Settings → Stream → Service: Custom → paste both → Apply
  4. Start streaming in OBS
  5. Castream Web → Go Live Dashboard → select YouTube, Twitch, TikTok → Go Live

Settings that satisfy all three

The genuine tension in this trio: TikTok wants vertical video; YouTube and Twitch want horizontal. Decide based on where your growth comes from:

  • Vertical (9:16, 1080 × 1920) if TikTok discovery is the priority
  • Horizontal (16:9, 1920 × 1080) if YouTube/Twitch are the priority and TikTok is a bonus feed

Beyond orientation:

  • Framerate: 30 FPS is safe everywhere. Use 60 only for fast gameplay and a connection that can sustain it.
  • Bitrate: you're feeding three platforms from one upload. 6–8 Mbps if your connection is strong; on mobile data, 4 Mbps is a safer ceiling.
  • Audio: test it before every stream. A cheap lavalier mic beats a phone mic at arm's length every time.

The bandwidth math

Three platforms, one upload connection. Run a speed test on the exact device and connection you'll stream from. Take the upload number and halve it — that's your safe streaming budget.

  • 8 Mbps budget: 1080p comfortably
  • 4–5 Mbps: drop to 720p — it looks better than a stuttering 1080p
  • Below 3 Mbps: this triple combo isn't viable; run two platforms instead

Wired beats Wi-Fi beats mobile data for stability. Test with a private stream first — five minutes, watch each platform's playback on a second device.

While you're live

Confirm TikTok manually. After Castream starts sending video, open TikTok's LIVE page, wait for the preview, then hit Go LIVE inside TikTok. YouTube and Twitch start automatically; TikTok usually doesn't.

Watch three chats. They don't merge — YouTube comments, Twitch chat, and TikTok comments each live on their own platform. Castream Web's unified chat view on a second screen helps.

Keep an eye on the weakest link. If one platform drops — almost always TikTok, usually an expired key — the other two keep running. Don't end the whole stream over it.

After the stream

  • YouTube keeps your VOD automatically — give it a real title and description instead of leaving the live default
  • Twitch saves VODs based on your account settings
  • TikTok lives don't stick around — clip your best 60–90 seconds and post it as a regular TikTok
  • Check your recordings in Castream — your profile keeps stream history with destinations and chat counts

Running YouTube, Twitch, and TikTok off one broadcast is the highest-leverage thing a live creator can do — three audiences, three discovery engines, one effort. Set the destinations up once, and from then on it's three toggles and a button.